Article
Agricultural Engineering
Jishi Zhang, Wenqian Zhao, Junwei Yang, Zhenmin Li, Junchu Zhang, Lihua Zang
Summary: Nickel ferrite nanoparticles have a promoting effect on hydrogen production in dark fermentation, with moderate amounts leading to increased H2 yields and excessive amounts causing a decrease in productivity. The nanoparticles enhance the butyrate pathway and optimize microbial community structure, leading to increased extracellular polymeric substances and ultimately higher H2 production.
BIORESOURCE TECHNOLOGY
(2021)
Article
Energy & Fuels
Haipeng Sun, Jiahe Shen, Mingyang Hu, Jingjing Zhang, Ziyuan Cai, Lihua Zang, Fengshan Zhang, Dandan Ji
Summary: The manganese ferrite nanoparticles were successfully synthesized and showed potential in enhancing biohydrogen production in both mesophilic and thermophilic fermentations, with a more significant impact observed in thermophilic conditions. This study highlights the promising role of MnFe2O4 NPs as a beneficial additive for bio-H-2 production, especially in higher temperature fermentation processes.
Article
Chemistry, Physical
Tobias Weide, Jens Peitzmeier, Christof Wetter, Marc Wichern, Elmar Bruegging
Summary: In this study, dark fermentation and subsequent mesophilic methanogenesis were conducted at different temperature conditions, showing variations in hydrogen and methane production rates, as well as discovering a hydrogen-producing organism.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Engineering, Environmental
Leonor Sillero, Rosario Solera, Montserrat Perez
Summary: The present study investigated the influence of hydraulic retention time (HRT) on methane production in temperature-phase anaerobic co-digestion (TPAcD). The study found that the optimal HRT for methane production was 12 days, which achieved high biodegradation and methane yield. The results also revealed that microbial population changes in the process were related to methane production and organic loading rate.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Agricultural Engineering
Xianyuan Cao, Lei Zhao, Weifang Dong, Haoe Mo, Teer Ba, Tianpeng Li, Dan Guan, Wenqian Zhao, Na Wang, Zhongmin Ma, Lihua Zang
Summary: The present study developed a dark fermentation system using AMNSs and MCB to enhance BioH(2) production. The interaction of AMNSs and MCB showed that AMNSs could assist in electron transfer and promote hydrogenase activity, leading to increased production of BioH(2).
BIORESOURCE TECHNOLOGY
(2022)
Article
Green & Sustainable Science & Technology
Mostafa Kiani Deh Kiani, Mostafa Parsaee, Zabiollah Mahdavifar
Summary: This study found that using static granular bed reactors (SGBR) under thermophilic conditions can achieve higher methane production and COD reduction rates when processing sugarcane vinasse, especially at a hydraulic retention time (HRT) of 4 days. Further research efforts are needed to define suitable operating conditions for potential use of SGBR systems in vinasse processing.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2021)
Article
Agricultural Engineering
Ying Gao, Jianwei Zhao, Chengzhi Qin, Qingjiang Yuan, Jiangwei Zhu, Yingjie Sun, Chenggang Lu
Summary: Fluoxetine inhibits biohydrogen production in anaerobic dark fermentation, even at low concentrations. High levels of fluoxetine reduce every step associated with biohydrogen production, including decreasing concentrations of ammonia nitrogen and phosphate and having a significant negative effect on enzyme activity.
BIORESOURCE TECHNOLOGY
(2021)
Article
Environmental Sciences
Luxin Yang, Liang Chen, Huan Li, Zhou Deng, Jianguo Liu
Summary: The study found that mesophilic fermentation is beneficial for both the yield and purity of lactic acid production, while thermophilic conditions limit other producers at low pH, resulting in a higher purity of lactic acid. Different microbes have different effects on lactic acid production under different conditions.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Biotechnology & Applied Microbiology
Jeong-Hee Kang, Sung-Won Kang, Weon-Jae Kim, Dong-Hoon Kim, Seong-Won Im
Summary: To address environmental issues caused by conventional plastics, bioplastics (BP) have emerged as a substitute. This study assessed the methane production yield (MPY) of BPs (polylactic acid (PLA) and polyhydroxyalkanoate (PHA)) with mechanical pretreatment and investigated the effects of co-digestion with food waste (FW). Results showed that PHA had higher MPYs compared to PLA, especially at a temperature of 55 degrees C. Co-digestion with FW demonstrated a synergistic effect on MPY, increasing it by 8.5-26.6% for PLA-fed tests and 12.7-25.5% for PHA-fed tests. The biodegradation rates of PLA and PHA were improved in co-digestion tests. Co-digestion of FW with mechanical pretreatment appears to be a viable treatment option for BPs.
FERMENTATION-BASEL
(2022)
Article
Engineering, Environmental
Kamran Manzoor, Sher Jamal Khan, Maria Yasmeen, Yousuf Jamal, Muhammad Arshad
Summary: The performance of a lab-scale anaerobic membrane distillation bioreactor system for treating high-strength synthetic textile wastewater was evaluated. The system achieved high removal efficiencies for COD and color, while maintaining steady biogas production and low conductivity.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Review
Biochemistry & Molecular Biology
Alexa L. Knight, Vinnie Widjaja, George P. Lisi
Summary: Mesophilic and thermophilic enzyme counterparts are studied to understand their functions under harsh conditions. Thermophiles regulate their structural ensemble through intra-protein communication and altered interactions with ligands to function well outside of standard temperature ranges. Recent studies have shown that the enhancement or diminution of allosteric crosstalk can be temperature-dependent and distinguish thermophilic enzymes from their mesophilic counterparts. However, the impact of temperature on allosteric function is understudied compared to other factors such as pH, mutations, or ligands.
FRONTIERS IN MOLECULAR BIOSCIENCES
(2023)
Article
Environmental Sciences
Rui Liu, Hui Gong, Ying Xu, Chen Cai, Yu Hua, Lei Li, Lingling Dai, Xiaohu Dai
Summary: The study found that raising the digestion temperature of corn stover from mesophilic to 42 degrees Celsius can increase the biomethane potential without the need for additional acid, and also lead to a change in the metabolic pathways of methanogens. Therefore, the transition temperature from mesophilic to thermophilic micro-organisms may be a promising option for anaerobic digestion of corn stover.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Iryna Lanko, Jakub Hejnic, Jana Rihova-Ambrozova, Ivet Ferrer, Pavel Jenicek
Summary: The study compared the digestate quality of single-stage mesophilic and thermophilic AD and TPAD systems, showing that the TPAD system is the most beneficial in terms of organic matter degradation efficiency, dewaterability, and pathogenic safety.
Article
Environmental Sciences
Shafiul Haque, Rajeev Singh, Dan Bahadur Pal, Hani Faidah, Sami S. Ashgar, Mohammed Y. Areeshi, Atiah H. Almalki, Bhawna Verma, Neha Srivastava, Vijai Kumar Gupta
Summary: This review evaluates and enhances the production of thermophilic biohydrogen using organic, cellulosic waste as a potential bioresource. The combination of suitable organic and cellulose-rich substrates, thermotolerant microbes, and stable enzymes can significantly improve biohydrogen production. Various factors that contribute to enhancing biohydrogen production are discussed, as well as the limitations of the thermophilic biohydrogen production strategy. The review also explores future prospects such as structural and functional microbiome analysis, genetic engineering for fermentation pathway modifications, and the application of nanotechnology to enhance thermophilic biohydrogen production.
Article
Energy & Fuels
M. S. Romero-Guiza, L. Pereira, X. Tomas, J. Palatsi, P. Icaran, V. M. Monsalvo
Summary: Temperature-phased anaerobic digestion is a valuable alternative for wastewater treatment and biomethane production, showing advantages in terms of VSrem and H2S content when fed with 95% sludge and 5% crude glycerine. This system can achieve up to 68% extra heat production compared to conventional mesophilic anaerobic systems.
Article
Environmental Sciences
Tiago B. Ferreira, Fabiana Passos, Claudio Leite de Souza
Summary: This study evaluated the operational conditions of an anaerobic reactor treating food waste after long-term operation without temperature control and low-intensity mixing. The results showed that the reactor was unstable at a relatively low organic loading rate, most likely due to the accumulation of recalcitrant material. Attention should be paid to the management of this material for sustainable long-term operation.
ENVIRONMENTAL TECHNOLOGY
(2023)
Article
Environmental Sciences
Jeny Ventura, Franciele Pereira Camargo, Isabel Kimiko Sakamoto, Edson Luiz Silva, Maria Bernadete Amancio Varesche
Summary: This study evaluated the effects of yeast extract and sodium fumarate on the removal of nonylphenol ethoxylathe from domestic sewage under anaerobic conditions. The optimal conditions resulted in a removal efficiency of 97% for the nonylphenol ethoxylathe, mainly through biodegradation.
ENVIRONMENTAL TECHNOLOGY
(2023)
Article
Environmental Sciences
Franciele Pereira Camargo, Isabel Kimiko Sakamoto, Tiago Palladino Delforno, Cedric Midoux, Iolanda Cristina Silveira Duarte, Edson Luiz Silva, Ariane Bize, Maria Bernadete Amancio Varesche
Summary: This study characterized the microbial community and metabolic pathways of an UASB reactor sludge used for thermophilic treatment of sugarcane vinasse. The analysis revealed important genes encoding enzymes for anaerobic digestion processes with different wastes and identified dominant bacterial and archaeal genera. The findings provide valuable information for future biotechnological research focused on anaerobic digestion and the production of value-added by-products.
ENVIRONMENTAL TECHNOLOGY
(2023)
Article
Biotechnology & Applied Microbiology
Camila A. B. Silva Rabelo, Franciele P. Camargo, Isabel Kimiko Sakamoto, Maria Bernadete A. Varesche
Summary: Enzymatically pre-treated sugarcane bagasse was utilized as a substrate for sequential hydrogen and methane production. Autochthonous bacteria were responsible for hydrogen production in the first stage, while allochthonous inoculum utilized the metabolites for methane production in the second stage. Hydrogenotrophic and acetoclastic archaeal genera were crucial for maintaining low hydrogen pressure in the system.
ENZYME AND MICROBIAL TECHNOLOGY
(2023)
Article
Chemistry, Physical
Camila Aparecida de Menezes, Priscilla de Souza Almeida, Tiago Palladino Delforno, Valeria Maia de Oliveira, Isabel Kimiko Sakamoto, Maria Bernadete Amancio Varesche, Edson Luiz Silva
Summary: This study investigated the effect of increasing the organic loading rate (OLR) on the co-fermentation of glycerol and sugarcane vinasse in a thermophilic anaerobic fluidized bed reactor. The highest hydrogen production rate and yield were observed at an OLR of 120 kg COD m-3 d-1, with butanoate as the major liquid metabolite. The synthesis of butanoate was attributed to the reverse b-oxidation of lactate and the synergistic interaction between Clostridium and Lacti-caseibacillus in the reactor.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Environmental Sciences
Camila Aparecida de Menezes, Priscilla de Souza Almeida, Franciele Pereira Camargo, Tiago Palladino Delforno, Valeria Maia de Oliveira, Isabel Kimiko Sakamoto, Maria Bernadete Amancio Varesche, Edson Luiz Silva
Summary: The study assessed the co-digestion of sugarcane vinasse and glycerol in a thermophilic anaerobic fluidized bed reactor. Increasing the organic loading rate had a positive effect on methane production, reaching the highest rate at 20 kg COD m-3 d-1. The presence of sulfate did not impact methane yield due to glycerol addition, and certain bacteria and archaea were identified in the process.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Review
Green & Sustainable Science & Technology
Karen C. L. Fung, Henrique S. Dornelles, Maria B. A. Varesche, Tony Gutierrez
Summary: Synthetic chemical surfactants (SCSs) are widely used in various industrial applications, but their release into the environment has caused significant damage and potential toxic effects. As a result, there is a growing demand for sustainable alternatives, such as biosurfactants, which are biodegradable and non-toxic. However, the low yields and high production costs of microbial biosurfactants pose challenges for their commercialization. This review focuses on discussing the release of SCSs, their impact on marine organisms and humans, and the potential of microbial biosurfactants as replacements.
Article
Energy & Fuels
Danilo Henrique Donato Rocha, Isabel Kimiko Sakamoto, Maria Bernadete Amancio Varesche
Summary: Solid waste and wastewater from citrus processing can be used as raw materials for biofuel production. Co-fermentation of these substrates has not been explored, and further investigation is needed to evaluate process variables and increase H2 production. The concentration of citrus peel waste and citrus processing wastewater, as well as particle size, were found to have a significant effect on H2 production.
Article
Environmental Sciences
Alice Kimie Martins Morita, Isabel Kimiko Sakamoto, Maria Bernadete Amancio Varesche, Edson Wendland
Summary: This research evaluated the effects of capping on a landfill in Sao Carlos, Brazil. The study found that capping construction reduced oxygen availability and created reducing conditions, promoting the growth of sulfate-reducing bacteria and the immobilization of metals as sulfides. The microbial populations under capped zones were different from those in uncapped zones, and methanogenic activity was not affected by capping.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Environmental
Caroline Varella Rodrigues, Franciele Pereira Camargo, Vitor Alves Lourenco, Isabel Kimiko Sakamoto, Sandra Imaculada Maintinguer, Edson Luiz Silva, Maria Bernadete Amancio Varesche
Summary: This study focuses on optimizing the interaction of waste from coffee processing and breweries' production chain to obtain methane through anaerobic codigestion. By using batch reactors with mixed culture, the researchers were able to identify the optimal conditions for methane production and predict the energy supply for the farm.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Environmental Sciences
Priscilla de Souza Almeida, Camila Aparecida de Menezes, Isabela Mehi Gaspari Augusto, Ana Paula Paulinetti, Giovanna Lovato, Jose Alberto Domingues Rodrigues, Edson Luiz Silva
Summary: This study analyzed the technical and economic feasibility of waste co-digestion and two-stage systems for the production of hydrogen and methane. The results showed that high-temperature single-stage systems and high-temperature/medium-temperature two-stage systems were more compact and required lower initial investment. Risk analysis revealed low investment risks, with electricity sales price being the key determining factor. Factorial design showed that rising inflation and electricity sales price positively affected the net present value, while rising capitalization rate had a negative impact.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
